(a) Figure Q4(a) shows a circuit for voltage regulator. (VREF is a reference DC voltage). Vcc=3.3V VREF VBASE Qs O VOUT RI VF RL R2 Figure Q4(a) (i) Describe three functional operations of the voltage regulator shown in Figure Q4(a). If VREF = 1.0 V, determine the ratio of R1/ R2 to provide regulated output voltage of 2.0 V at VOUT. (ii) (iii) If RL is removed from the voltage regulator, explain the effects to the DC voltage at node VOUT, VF, and VBASE through negative feedback.

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Analogue electronics 2

Question 4
(a) Figure Q4(a) shows a circuit for voltage regulator. (VREF is a reference DC voltage).
Vcc=3.3V
VREF O
VBASE
Q5
VOUT
Ri
VF
RL
R2
Figure Q4(a)
(i)
Describe three functional operations of the voltage regulator shown in Figure
Q4(a).
If VREF = 1.0 V, determine the ratio of R1/ R2 to provide regulated output
voltage of 2.0 V at VOUT.
(ii)
If RL is removed from the voltage regulator, explain the effects to the DC
voltage at node VOUT, VF, and VBASE through negative feedback.
(iii)
Re-design the circuit diagram shown in Figure Q4(a) by replacing Qs PNP
transistor with a NPN transistor.
(iv)
Transcribed Image Text:Question 4 (a) Figure Q4(a) shows a circuit for voltage regulator. (VREF is a reference DC voltage). Vcc=3.3V VREF O VBASE Q5 VOUT Ri VF RL R2 Figure Q4(a) (i) Describe three functional operations of the voltage regulator shown in Figure Q4(a). If VREF = 1.0 V, determine the ratio of R1/ R2 to provide regulated output voltage of 2.0 V at VOUT. (ii) If RL is removed from the voltage regulator, explain the effects to the DC voltage at node VOUT, VF, and VBASE through negative feedback. (iii) Re-design the circuit diagram shown in Figure Q4(a) by replacing Qs PNP transistor with a NPN transistor. (iv)
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